Fix remaining Java Serialization issues with JDK21

generator/Generator.sc

@@ -1105,7 +1105,7 @@ def generateMainClasses(): Unit = {
                   private static final long serialVersionUID = 1L;
 
                   private final Pattern0<T> pattern;
-                  private final $FunctionType<? super T, ? extends R> f;
+                  private transient final $FunctionType<? super T, ? extends R> f;
 
                   private Case0(Pattern0<T> pattern, $FunctionType<? super T, ? extends R> f) {
                       this.pattern = pattern;
@@ -1131,13 +1131,18 @@ def generateMainClasses(): Unit = {
                   case 2 => BiFunctionType
                   case _ => s"Function$i"
                 }
+                val accessModifier = i match {
+                  case 1 => "transient final"
+                  case 2 => "transient final"
+                  case _ => "final"
+                }
                 xs"""
                   public static final class Case$i<T, $generics, R> implements Case<T, R> {
 
                       private static final long serialVersionUID = 1L;
 
                       private final Pattern$i<T, $generics> pattern;
-                      private final $functionType<$argTypes, ? extends R> f;
+                      private $accessModifier $functionType<$argTypes, ? extends R> f;
 
                       private Case$i(Pattern$i<T, $generics> pattern, $functionType<$argTypes, ? extends R> f) {
                           this.pattern = pattern;
@@ -2354,7 +2359,9 @@ def generateMainClasses(): Unit = {
         /**
          * The base interface of all tuples.
          */
-        public interface Tuple {
+        public interface Tuple extends ${im.getType("java.io.Serializable")} {
+
+            long serialVersionUID = 1L;
 
             /**
              * The maximum arity of an Tuple.
@@ -2438,7 +2445,10 @@ def generateMainClasses(): Unit = {
       /**
        * Helper to replace reflective array access.
        */
-      interface ArrayType<T> {
+      interface ArrayType<T> extends Serializable {
+
+          long serialVersionUID = 1L;
+
           @SuppressWarnings("unchecked")
           static <T> ArrayType<T> obj() { return (ArrayType<T>) ObjectArrayType.INSTANCE; }
 

src-gen/main/java/io/vavr/Tuple.java

@@ -32,13 +32,16 @@
 
 import io.vavr.collection.Seq;
 import io.vavr.collection.Stream;
+import java.io.Serializable;
 import java.util.Map;
 import java.util.Objects;
 
 /**
  * The base interface of all tuples.
  */
-public interface Tuple {
+public interface Tuple extends Serializable {
+
+    long serialVersionUID = 1L;
 
     /**
      * The maximum arity of an Tuple.

src-gen/main/java/io/vavr/collection/ArrayType.java

@@ -37,7 +37,10 @@
 /**
  * Helper to replace reflective array access.
  */
-interface ArrayType<T> {
+interface ArrayType<T> extends Serializable {
+
+    long serialVersionUID = 1L;
+
     @SuppressWarnings("unchecked")
     static <T> ArrayType<T> obj() { return (ArrayType<T>) ObjectArrayType.INSTANCE; }
 

src/main/java/io/vavr/collection/Array.java

@@ -51,6 +51,7 @@ public final class Array<T> implements IndexedSeq<T>, Serializable {
 
     private static final Array<?> EMPTY = new Array<>(new Object[0]);
 
+    @SuppressWarnings("serial") // Conditionally serializable
     private final Object[] delegate;
 
     private Array(Object[] delegate) {

src/main/java/io/vavr/collection/BitMappedTrie.java

@@ -65,6 +65,7 @@ final class BitMappedTrie<T> implements Serializable {
     static <T> BitMappedTrie<T> empty() { return (BitMappedTrie<T>) EMPTY; }
 
     final ArrayType<T> type;
+    @SuppressWarnings("serial") // Conditionally serializable
     private final Object array;
     private final int offset, length;
     private final int depthShift;

src/main/java/io/vavr/collection/HashArrayMappedTrie.java

@@ -380,7 +380,9 @@ final class LeafSingleton<K, V> extends LeafNode<K, V> implements Serializable {
         private static final long serialVersionUID = 1L;
 
         private final int hash;
+        @SuppressWarnings("serial") // Conditionally serializable
         private final K key;
+        @SuppressWarnings("serial") // Conditionally serializable
         private final V value;
 
         LeafSingleton(int hash, K key, V value) {
@@ -449,7 +451,9 @@ final class LeafList<K, V> extends LeafNode<K, V> implements Serializable {
         private static final long serialVersionUID = 1L;
 
         private final int hash;
+        @SuppressWarnings("serial") // Conditionally serializable
         private final K key;
+        @SuppressWarnings("serial") // Conditionally serializable
         private final V value;
         private final int size;
         private final LeafNode<K, V> tail;
@@ -598,6 +602,7 @@ final class IndexedNode<K, V> extends AbstractNode<K, V> implements Serializable
 
         private final int bitmap;
         private final int size;
+        @SuppressWarnings("serial") // Conditionally serializable
         private final Object[] subNodes;
 
         IndexedNode(int bitmap, int size, Object[] subNodes) {
@@ -711,6 +716,7 @@ final class ArrayNode<K, V> extends AbstractNode<K, V> implements Serializable {
 
         private static final long serialVersionUID = 1L;
 
+        @SuppressWarnings("serial") // Conditionally serializable
         private final Object[] subNodes;
         private final int count;
         private final int size;

src/main/java/io/vavr/collection/RedBlackTree.java

@@ -50,7 +50,9 @@
  *
  * @param <T> Component type
  */
-interface RedBlackTree<T> extends Iterable<T> {
+interface RedBlackTree<T> extends Iterable<T>, Serializable {
+
+    long serialVersionUID = 1L;
 
     static <T> RedBlackTree<T> empty(Comparator<? super T> comparator) {
         Objects.requireNonNull(comparator, "comparator is null");
@@ -351,6 +353,7 @@ final class Node<T> implements RedBlackTree<T>, Serializable {
         final Color color;
         final int blackHeight;
         final RedBlackTree<T> left;
+        @SuppressWarnings("serial")
         final T value;
         final RedBlackTree<T> right;
         final Empty<T> empty;
@@ -828,6 +831,7 @@ final class Empty<T> implements RedBlackTree<T>, Serializable {
 
         private static final long serialVersionUID = 1L;
 
+        @SuppressWarnings("serial") // Conditionally serializable
         final Comparator<T> comparator;
 
         // This is no public API! The RedBlackTree takes care of passing the correct Comparator.

src/main/java/io/vavr/collection/Tree.java

@@ -833,6 +833,7 @@ public static final class Node<T> extends Tree<T> implements Serializable {
 
         private static final long serialVersionUID = 1L;
 
+        @SuppressWarnings("serial") // Conditionally serializable
         private final T value;
         private final io.vavr.collection.List<Node<T>> children;
 

src/main/java/io/vavr/collection/TreeMap.java

@@ -1533,6 +1533,7 @@ final class Specific<K, V> implements EntryComparator<K, V> {
 
             private static final long serialVersionUID = 1L;
 
+            @SuppressWarnings("serial") // Conditionally serializable
             private final Comparator<K> keyComparator;
 
             @SuppressWarnings("unchecked")

src/test/java/io/vavr/collection/BitSetTest.java

@@ -594,7 +594,9 @@ private static final class Mapper<T> implements Serializable {
 
         private static final long serialVersionUID = 1L;
 
+        @SuppressWarnings("serial") // Conditionally serializable
         private final java.util.Map<Integer, T> fromIntMap = new java.util.HashMap<>();
+        @SuppressWarnings("serial") // Conditionally serializable
         private final java.util.Map<T, Integer> toIntMap = new java.util.HashMap<>();
         private int nextValue = 0;